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Type: Artigo de periódico
Title: One-step synthesis of alkyltrimethylammonium-intercalated magadiite
Author: Pastore, HO
Munsignatti, M
Mascarenhas, AJS
Abstract: Cetyltrimethylammonium- and tetradecyltrimethylammonium-intercalated magadiites were prepared by direct syntheses, starting from sodium metasilicate (Na2O/SiO2 = 1.0) and nitric acid. Total substitution of sodium by cetyltrimethylammonium or tetradecyltrimethylammonium cations was not achieved in the range of surfactant:silicon molar ratios used in this study. When a phosphoniun-based surfactant replaces the ammonium surfactants in the same procedure, the result of the synthesis is a mixture of quartz and unmodified surfactant. If dodecylammonium bromide is used, an MCM-41 molecular sieve is obtained. The substitution of the silicon source by tetramethylammonium silicate or of nitric acid by hydrochloric, hydrofluoric, or acetic acids also yields MCM-41 molecular sieves, indicating that the formation of magadiite is greatly dependent on the presence of sodium cations and nitrate anions.
Subject: alkylammomium-intercalated magadiite
Country: EUA
Editor: Clay Minerals Society
Citation: Clays And Clay Minerals. Clay Minerals Society, v. 48, n. 2, n. 224, n. 229, 2000.
Rights: embargo
Identifier DOI: 10.1346/CCMN.2000.0480208
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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